Type writing machine



(No Model.) 2 SheetsS heet 1. G. B. WEBB. TYPE WRITING MACHINE.

No. 520,586. Patented May 29, 1894.

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G. B. WEBB. TYPE WRITING MACHINE.

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No. 520,586. Patented May 29, 1894.

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UNITED STATES PATENT OFFICE.

GEORGE B. WEBB, OF NEW YORK, N. Y., ASSIGNOR TO THE WYCKOFF, SEAMANS &BENEDIGT,OF SAME PLACE.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 520,586, dated May 29,1894.

Application filed September 26, 1 892. Renewed March 8, 1894. Serial No.502,919. (No model.) Patented in England March 18,1893,No. 1,570.

To aZZ whom it may concern.-

Be it known that I, GEORGE B. WEBB, a citizen of the United States, anda resident of New York city, in the county of New York and State of NewYork,have invented certain new and useful Improvements in Type-WritingMachines, of which the following is a specification.

My invention has for its main object to provide, in a type writingmachine, a simple, light and readily adjustable and accessible shiftingplaten-carrier, and consists in the features of construction andcombinations of devices hereinafter more fully described andparticularly pointed out in the appended claims.

British Patent No. 1,570 of March 18, 1893, has been obtained for thisinvention. 7

In the accompanying drawings, Figure 1 is a plan view of as much of atype writing machine as is necessary to illustrate my invention. Fig. 2is a side elevation of the same. Fig. 3 is a vertical cross-sectiontaken at the line 00, w of Fig. 1, but with the platen shifted, and Fig.4 is a front elevation of the shift-rod and the upper portion of thelevers to which the said rod is secured.

In the various views the same parts will be found designated by the samenumerals of reference.

1 is the top-plate of the machine, 2 the paper-carriage orplaten-carrier, 3 the platen mounted to rotate therein, and 4 a feed orpressure-roller hung at the lower ends of pivoted arms 5, having springs6 to hold said roller normally in contact with the platen. The carriageor platen-carrier is provided at its front side with two frames orhousings 7, in each of which is mounted a roll 8, which bears and ridesupon a shift-rod 9, secured at the upper ends of a pair of arms orlevers 10 mounted upon a rock-shaft 11 held in the frame work of themachine below the topplate, and by means of a rod 12 connected to afinger lever or shift-key, as usual but not The platen-carrier isprovided at its rear side with two arms 13, which project rearwardly andat their free ends are pivoted at 14: to the upper end or portion of alink or coupler 15, which at its lower end or portion arm 22, to whichis screwed or otherwise fastened, a bar 23, and a parallel andcontiguous feed-rack 24, the bar 23 bearing upon a small anti-frictionroll 25, and the feed-rack engaging with a pinion 26. The anti-frictionroll 25 and the pinion 26 are both mounted on a shaft 27 arranged torevolve step-bystep in a bearing 28 on the top-plate, and provided witha ratchet-wheel 29 at its rear end, with which engages the feed orspacing-dogs 30. The latter may be connected to any known or suitablespacing rockers or trunnions.

The yoke or small carriage 18 may be connected to any known or suitablecarriage driving-mechanism having a tendency to pull the yoke and theconnected platen-carrier toward the left. This tendency of thedrivingmechanism, as heretofore, is communicated through the rack,pinion and shaft to the ratchet-wheel and spacing dogs, which latterdevices prevent the carriage from' moving more than one letter space ata time during the operation ofv printing, as more fully set forth inLetters Patent granted to me March 29, 1892, No. 471,710. Q

The weight of the rear side of the platencarrier rests at a point inrear of the guiderail 19 and thus tends to throw the rack downwardlyinto engagement with its pinion, and maintain such engagement. If theweight of the carriage were forward of said guiderail. 2. spring mightbe used to keep the rack and pinion normally in mesh, as in my saidpatent. In either such case it is necessary to avoid pressure betweenthe rack and its pinion; or,-in other words, it is essential that thepoints of the teeth of either member shall not bear unduly at the basesof the notches of the other members, and to insure this operation, Ihave provided the bar 23 and antifriction roll 25. The face of thelatter is formed with a radius substantially equal to that of thepitch-line of the teeth of the pinion, and hence, together with the bar23, limits the downward movement of the feed-rack and defines the extentof engagement between said rack and its pinion. As a consequence, thefriction or resistance to movement and the wear of the teeth are largelyrelieved by the bar and the anti-friction roll. About centrally of thebar 23 is affixed an adjustable stop 31 in the form of a screw, whichmay serve to limit the rearward vibration or movement of theplaten-carrier during the shifting operation of the same for upper casework, a projection 32 on the back of the coupler or link 15 oppositesaid stop being adapted to contact therewith. The said stop is designedmore especially, however, to limit the movement of the platen-carrierand couplerwhen the platen is raised or turned up,

as shown-at Fig. 2for inspection of the work. The coupler 15 is providedwith two upwardly-eXtending-stops 33 to limit the hinge motion in theraising ofvthe platen-carrier.

Inaddition to the front rolls 8, which partially embrace the shift-rail9, the front of the platen-carrier is provided with a fork 34,which-straddles the shift-rail, and which by reason of its flaringsides, is adapted to guide the platen-carrier to its normal position,with the-rolls.- 8 bearing on the shift-rail when the platen-carrier isturned-down to a horizontal position. Theshift-rail levers 10 restagainst frontstops 35'on the top-plate in the normal position of theplaten-carrier, and strike against and are limited by similarstops 36inshifting the platen-carrier rearwardly for upper case work; but thestops 36 may be omitted in consequence of the presence of the stop 31,which may also limit the shifting movementof-the carriage.

When the platen-carrier is shifted rearwardly the rear part of the sameacts on the upper-portion of the coupler, and the latter is caused'toswing about its pivots 16 below the guide-rail, and since the front partof the platencarrier is causedto swing about the rock-shaft 11; theWhole movement is effected upon pivots or links, which is a much moredesirable construction than the sliding plan heretofore largely used.The roll 21 does not support the rear side of the platen-carrier, assuch 1 support is effected wholly and at all timesxby the coupler.

The yoke or small carriage 18 is capable of partial rotation about therail 19, to enablethe feed rackto be liftedfrom engagement with itsshaft in order that the carriage may be quickly moved in eitherdirection, and to facilitate such disengagement of the feedrackand thepinion, the yoke is provided on its front sidewith a release-key 36,which is bent to terminate preferably at the left hand sideof theplaten-carrier. By depressing the finger-portion of: the release-key theyoke with its wheel is rocked around the back rod or rail 19, therebylifting the rear portion of the same direction as the scale bar 39, and

with. the scale-bar 40 may be used the stationary pointer or index 41secured to the top-plate.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a type writing machine, the combination of a platen-carrier, aguide-rail, .a yoke adapted to travel thereon, a link or coupler pivotedto said yoke in rear of saidguiderail at one end, andalso'pi-voted tothe rear end of the platen-carrier, and means for shifting saidplaten-carrier.

2. In a type writing machine, the combinationof a platen-carrier,aguide-rail, a yoke adapted to travel thereon and'provided withdownwardly and rearwardly-extending.arms, a link or; coupler, in rear ofsaid'guide-rail, pivoted to the rear portion of-the'platen-c'arrier andto said downwardly and rearwardlyextending arms, and a' vibratoryshift-rod.-

3. In a type writing machine, the combination of a platen-carrier, aguide-rail, ayoke adapted to travel and also to oscillate thereon andprovided with the feed-rack of an escapement mechanism, a link orcoupler "in rear of said guide-rail and pivotally-connected to the saidyoke and to the rear portion of th'eplatencarrier, and means forshifting the platencarrier.

4. In atype writing machine, the-combina-v tion of a platen-carrier, aguide-rail, a yoke adapted to travel and also to oscillate thereon andprovided with a feed-rack, apinion, a ratchet-wheel, a spacing-dog, acoupler in rear of said guide-rail connected to said yoke and to therear side of the platen-carrier, a release-key, and means for shiftingsaid platencarrier.

5. In a type writing machine, the-combination of a shiftingplaten-carrier, a guide-rail, a yoke adapted to travel and also tooscillate thereon, and provided with the feed-rack'of an escapementmechanism, alink or-cou-pler, in rear of said guide-rail,pivotally-connected to said yokeand to the rear portion of theplaten-carrier, and a stop' for limiting. the movement: of the link orcoupler when the platen-carrier is turned up forinspection of adapted totravel and also to oscillate thereon and provided with a feed-rack, apinion, a

ratchet-wheel, a dog, a link or coupler, in rear of said guide-rail,pivotally-connected to said yoke and to the rear portion of saidplatencarrier, a release-key attached to the said oscillating yoke forraising said feed-rack, a stop to limit the rearward movement of thelink or coupler when the platen-carrier is turned up, a stop to limitthe hinge-movement of the platen-carrier when turned up, and a vibratoryshift-rod.

7. In a type writing machine, the combination of a vibratory feed-rack,a step-by-step rotatory pinion arranged beneath the same, a bearing-bararranged adjacent to and parallel with said feed-rack, and ananti-friction roll for and beneath said bar arranged adjacent toandparallelwith said pinion.

8. In a type writing machine, the combination of a vibratory feed-rack,a bearing-bar, a step-by-step rotatory shaft, apinion on said; shaft toengage the said feed-rack, and an anti-friction roll on said shaft toco-operate with said bearing-bar the feed-rack and the bearing-bar beingarranged in parallel planes, and the pinion and anti-friction roll beingalso arranged in parallel planes and beneath respectively the saidfeed-rack and the said bearing-bar.

9. In a type writing machine, the combination of a. shiftingplaten-carrier, a guide-rail, a yoke adapted to travel and also tooscillate thereon, a link or coupler in rear of said guide-rail andpivotally-connected to the rear side of the platen-carrier and to saidyoke, a feedrack and a bearing-bar connected to said yoke, and astep-by-step rotatory shaft provided with a pinion and an anti-frictionr011.

Signed at New York city, in the county of New York and State of NewYork, this 21st day of September, A. D. 1892.

GEORGE B. WEBB.

Witnesses:

JACOB FELBEL, IDA MACDONALD.

